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Return of Experience for Microturbines Running on Landfill Gas // waste water gas in Europe

Return of Experience for Microturbines Running on Landfill Gas // waste water gas in Europe. Xavier LOMBARD General Manager Belgium // France Switzerland // Austria. January 26th, 2005. Xavier.lombard@verdesis.com. Green electricity out of Capstone microturbine.

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Return of Experience for Microturbines Running on Landfill Gas // waste water gas in Europe

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  1. Return of Experience for Microturbines Running on Landfill Gas // waste water gas in Europe Xavier LOMBARD General Manager Belgium // France Switzerland // Austria January 26th, 2005 Xavier.lombard@verdesis.com

  2. Green electricity out of Capstone microturbine 1- Capstone Microturbine running on landfill Return of experience for the microturbine compared to the piston engine 2- Capstone Microturbine running on Waste Water treatment 3- Capstone Microturbine running on landfill gas

  3. Italy: Landfill 1Million m3 waste Landfill close in 1994 Biogas - CH4 = 45%, - Flow = 165m3/h In 1994: 2 engines of 500kW In 1998: 1 engine 500kW In 2002: 1 engine 250kW Cunéo – Italy July 2002

  4. Capstone Microturbine 30kW 28% efficiency Nox =1ppm CO = 200ppm

  5. Reciprocating Engine Microturbine Biogas chiller Biogas chiller Compressor Container Leanox System & compressor Air Cooling Exhaust cleaning (Post-combustion) Disconnector / Circuit breaker Disconnector / Circuit breaker Synchronization relay Grid Protection Grid Protection Table 1 : Reciprocating Engine versus Microturbines installation

  6. Lessons learned from the Engine/microturbine comparison Engine • The efficiency is dramatically decreasing when CH4<50%. • Maintenance cost is fix (even at part load) • Auxiliary losses remain practically constant, which penalizes the economics at part load; • Operator had to restart manually the engine. • The starting procedure is very sensitive to the methane content. Microturbines • Easy to install / easy to move to another site • The ability to run with low methane content: CH4 > 35% • Efficiency does not decrease with the low methane content • Several microturbines to follow the biogas generation curve • Several microturbines allow keeping maintenance price # kWh.

  7. Generation costs on the site (excluding biogas captation) 2002 2003 2004 6xC30 7xC30 8xC30 Microturbines flexibility brings higher revenues on the long term

  8. Power available in the methane in a landfill • Microturbines runs for 35% < CH4 < 45%

  9. Engine Efficiency Figure 4 : Engine Efficiency CH4%  engine efficiency  CH4%  microturbine efficiency 

  10. Switzerland: Waste Water treatment Capstone : C30kW Eltacon : Compressor & chiller

  11. Lessons learned from the Swiss WWTP experiment Microturbines 400hours 200 starts • Good behaviour from –10°C up to 45°C • Smart Proportional valve changed 100k€ Equipment +Installation Heat exchanger • Need 100% by-pass for the flue exhaust • Hot water overheat very fast Compressor and chiller • Variable speed control motor for proportional losses • Condensate float ball valve not reliable technology • Biogas chilling for drying and cleaning the biogas

  12. Waste water treatment plant – Marche en famenne - Belgium 4 months of continuous operation seamless Propriété intellectuelle Verdesis Verdesisdesign concept Applied Filter Technology Verdesis distributor

  13. Lessons learned from Marche en Famenne WWTP 2000hours 50 starts Microturbines • Good behaviour from –10°C up to 45°C • Smart Proportional valve changed (every 1000hours) 120k€ Equipment +Installation Heat exchanger • Need safety lock for no exhaust interruption Green certificates = 90€/MWh Self consuption =60€/MWh Compressor and chiller • SAG filter on high pressure side • essential to protect the microturbine • Gas reserve to mitigate pressure swing for inlet gas turbine

  14. Landfill – Sprésiano - Italy Two microturbines biogas [35%-45%] Verdesis project commissioned in January 2004

  15. Lessons learned from Sprésiano Landfill Microturbines 300hours 20 starts • Operation with CH4 <> 30% occasionnaly • Gas quantity was lower than expected • One C30 runs part load 120k€ Equipment +Installation Green certificates = 90€/MWh Self consuption =35€/MWh

  16. Landfill – Des-Isnes - Belgium

  17. Lessons learned from Des-Isnes Landfill Microturbines 500hours 20 starts • Noise is 85dBa @ 1m • Noise drop at 65 dBa @ 1m with silencer • NOx < 2ppm CO < 20ppm @ 15%O2 • Smart Proportional valve changed (every 2000hours) 400k€ Equipment +Installation Heat exchanger • Electrical valve for bypass are fragile Compressor and chiller Green certificates = 90€/MWh Self consuption =35€/MWh • Inlet back pressure @ compressor stop

  18. Conclusion for microturbines on biogas  run with low methane content: CH4 > 35%  microturbines flexibility improves revenue  Several microturbines allow keeping maintenance price # kWh.  Efficiency does not decrease with the low methane content On going development Microturbines project running on biogas throughout Europe >10 projects on landfill & sewage plant by end of 2005  Siloxanes filtration using proprietary system from USA 60+ reference with 100% efficiency in the USA

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